CVE-2026-49250 — Conform: parseSubmission vulnerable to CPU exhaustion when parsing many unique form fields
Conform, a type-safe form validation library, allows the parsing of nested objects in the form of object.property. From 1.8.0 until 1.19.4, the parseSubmission future API in pac…
Published: 2026-09-14 · CVSS: 8.7 · CVSS 4.0
Conform, a type-safe form validation library, allows the parsing of nested objects in the form of object.property. From 1.8.0 until 1.19.4, the parseSubmission future API in packages/conform-dom/formdata.ts repeatedly scans FormData or URLSearchParams entries by each unique field name. An unauthenticated attacker can submit a crafted form containing many unique names, causing excessive synchronous CPU work and denial of service in an application that passes the submission to parseSubmission. Applications should continue to enforce request parsing limits before invoking Conform. This issue is fixed in version 1.19.4.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7